NON-CONTACT POWER TRANSMISSION DEVICE AND DESIGN METHOD THEREOF

• US 20110298294A1
• Filed: 09/28/2009
• Published: 12/08/2011
• Est. Priority Date: 11/04/2008
• Status: Abandoned Application

• Current Assignee: Kabushiki Kaisha Toyota Jidoshokki, Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Kabushiki Kaisha Toyota Jidoshokki, Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Takada, Kazuyoshi, Suzuki, Sadanori, Nakata, Kenichi, Sakoda, Shimpei, Yamamoto, Yukihiro, Ichikawa, Shinji, Ishikawa, Tetsuhiro
• Application Number:
  US13/126,512
• Publication Number:
  US 20110298294A1
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: B60L 2210/20 AC to AC converters
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A non-contact power transmission device is disclosed. The resonant system includes a primary coil connected to the AC power source, a primary resonance coil, a secondary resonance coil, and a secondary coil is connected to the load. When the relationship between an input impedance of the resonant system and a frequency of an AC voltage of the AC power source is shown in a graph, the frequency of the AC voltage of the AC power source is set between a first frequency at which the input impedance has a local maximum value, and a second frequency that is greater than the first frequency and at which the input impedance has a local minimum value.

Claims

1. A non-contact power transmission device comprising an AC power source, a resonant system, and a load,

the resonant system including a primary coil connected to the AC power source, a primary resonance coil, a secondary resonance coil, and a secondary coil connected to the load,

the non-contact power transmission device being characterized in that, when the relationship between an input impedance of the resonant system and a frequency of an AC voltage of the AC power source is plotted on a graph, the frequency of the AC voltage of the AC power source is set between a first frequency, at which the input impedance has a local maximum value, and a second frequency, which is greater than the first frequency and at which the input impedance has a local minimum value.

2. The non-contact power transmission device according to claim 1, wherein the frequency of the AC voltage of the AC power source is set to a frequency between the first frequency and the second frequency, and at which the input impedance and an impedance of the primary coil are equal to each other.

3. The non-contact power transmission device according to claim 1, wherein the primary coil, the primary resonance coil, the secondary resonance coil, and the secondary coil have the same diameter.

4. A non-contact power transmission device comprising an AC power source, a resonant system, and a load,

the resonant system comprising a primary coil connected to the AC power source, a primary resonance coil, a secondary resonance coil, and a secondary coil connected to the load,

the non-contact power transmission device being characterized in that a frequency of an AC voltage of the AC power source is set within an input impedance decreasing range, which is a frequency range in which an input impedance of the resonant system is decreased as the frequency of the AC voltage is increased.

5. The non-contact power transmission device according to claim 4, wherein the frequency of the AC voltage of the AC power source is set to a frequency that is in the input impedance decreasing range and at which the input impedance and an impedance of the primary coil are equal to each other.

6. The non-contact power transmission device according to claim 4, wherein the primary coil, the primary resonance coil, the secondary resonance coil, and the secondary coil have the same diameter.

7. A method for designing a non-contact power transmission device comprising an AC power source, a resonant system, and a load,

the resonant system including a primary coil connected to the AC power source, a primary resonance coil, a secondary resonance coil, and a secondary coil connected to the load,

the design method being characterized in that, when the relationship between an input impedance of the resonant system and a frequency of an AC voltage of the AC power source is plotted on a graph, the frequency of the AC voltage of the AC power source is set between a first frequency, at which the input impedance has a local maximum value, and a second frequency, which is greater than the first frequency and at which the input impedance has a local minimum value.

8. The method according to claim 7, wherein the frequency of the AC voltage of the AC power source is set to a frequency between the first frequency and the second frequency, and at which the input impedance and an impedance of the primary coil are equal to each other.

9. A method for designing a non-contact power transmission device comprising an AC power source, a resonant system, and a load,

the resonant system including a primary coil connected to the AC power source, a primary resonance coil, a secondary resonance coil, and a secondary coil connected to the load,

the design method being characterized in that a frequency of an AC voltage of the AC power source is set within an input impedance decreasing range, which is a frequency range in which an input impedance of the resonant system is decreased as the frequency of the AC voltage is increased.

10. The method according to claim 9, wherein the frequency of the AC voltage of the AC power source is set to a frequency that is in the input impedance decreasing range and at which the input impedance and an impedance of the primary coil are equal to each other.